Power-hammer



W. H. BOTTING. POWER HAMMER.

PatentedDeo. 3, 1895.

@QQ/@Ma u i l @MM /fmgmm 1 @im M #A 39%,(

UNITED STATES PATENT OEETCE.

VILLIAM I-I. BOTTING, OF FITCHBURG, MASSACHUSETTS.

POWER-HAM M ER.

SPECIFICATION forming part of Letters Patent No. 550,581, dated December 3, 1895.

Application iledAugust l5, 1894. Serial No. 520,378. (No model.)

To @ZZ whom, it may concern:

Be it known that I, WILLIAM H. BOTTING, of Fitchburg, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Power- Hammers; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part ofthis specication, and to the letters of reference marked thereon.

This invention relates to improvements in manually-controlled mechanically operated hammers; and it has for its object to provide ahammer in which the rapidityT and number of blows may be perfectly controlled and which will give an exceedingly sharp quick impact or blow of greater power than can be obtained by a simple drop of the hammer head.

The invention consists in certain novel details of construction and combinations and arrangements of parts, all as will be now described, and pointed out particularly in the appended claims.

Referring to the accompanying drawings, Figure l is a front elevation of a hammer embodying my invention. Fig. 2 is a side elevation of the same. Figs. 3, 3a, and 3b are details of the clutch-lifter and belt-tightener. Figs. 4, 4a, and ab are details of the crankdisk for throwing the hammer. Figs. 5 and 5a are details of the preferred form of hammer-head, with the inclined ways formed in a single piece of metal.

Like letters of reference in the several ngures indicate the same parts.

The base A, as is usual in this class of machinery, is heavy and provided with a forwardly-projecting anvil or anvil-supporting portion A and an upwardly and forwardly projecting portion A* for guiding the hammer. The hammer or hammer-head B is mounted in suitable vertical guides C in the portion A2 of the base, and is adapted to have a face-block b or other style of tool or former, such as a punch or die, secured to its lower end in position to operate against a co-oper ating member, such as f', secured on the anvil.

At the top of the base-frame is ahorizontal bearing D, in which a drive-shaft E is journaled. A diskF is mounted on the forward end of this shaft, and a crank-pin F, adjust-V ably mounted in a dovetail groove f in the face of the disk, serves as the medium for i1n parting the. reciprocatory movement to the hammer.

To give the desired power and sharpness to the stroke and at the same time permit of a slight variable forward movement of the hammer, a pair of spring-arms H I-I, with their free ends working in oppositely-inclined ways I I, are interposed in the connection between the crankpin and hammer. In the preferred construction the inclined ways I I are on the hammer-head. In Fig. 1 they are shown as n straight and formed in the upper ends of rigid crossed bars 'L' o', bolted to the hammerhead at the lower end, and in Figs. 5 and 5a they are shown as `though formed in a single piece of metal dovetailed and keyed in the top of the hammer-head. In these latter iigures it will be noted that the ways, instead of being straight and of a uniform inclination, are inclined for a short distance at the top, then run vertically for a short distance, and finally have their lower ends inclined again..

From the crank-pin a short connecting-rod K extends downward and supports the adj ustable connecting-block, to which the springarms I-I I-I have their bases rigidly secured. Grooved antifriction-rollers h h are journ aled in the lower ends of the spring-arms and work in the ways I I on the hammer-head, the spring-arms thus constituting the support for the hammer-head.

The drive-shaft is provided with a clutch member M at the rear end, and a co-operating member M,forming part of a drive-pulley M2, is journaled loosely on the shaft in position to throw the clutch-sections into engagement when moved against the tension of the spring m, and in order to secure such movement of the pulley and clutch segment M a disk N is mounted on the shaft between the pulley and frame, and a cam, rib, or projection N' on this disk, normally lying in a corresponding recess in the frame, will ride out of its recess as the disk is turned and force the disk and pulley outward, throwing the clutch-sections together, as before stated. An operating-arm O is secured to the disk and connected through a rod O to a foot-treadle O2, extending around the machine in convenient posif tion for the operators foot.

The machine, it will thus be seen, may be thrown into operation by simply pressing the foot-treadle down; but it is desirable that means should be provided,iirst,for regulating the rapidity of the blows of the hammer, and, secondly, to arrest the hammer quickly and hold it in elevated position when the power is disconnected. To secure the first of these results, the driving-pulley has a relatively loose belt for its driving power, and a belt-tight ener P is adjustably mounted on an arm P', secured to the clutch-operating disk in position to engage the belt and tighten the same sufficiently to operate the hammer with varying degrees of rapidity, according to the degree of movement of the tightener. It will be noted that when the clutch-segments are in engagement and the cam on the disk out of its recess a further movement of the disk does not affect the clutch, but does tighten or loosen the belt to a greater or less extent, enabling the operator to adjust the blows to a nicety. g

To arrest the hammer a friction-disk R is mounted on the shaft next to the crank-disk in position to be forced against said disk by a spring r. This friction disk or brake, as I shall term it, is held against rotation by a stop S on the frame, and it is moved out of engagement by a bell-crank lever T, the long arm of which extends back beneath or into engagement with the operating-arm of the cam-disk, as shown clearly in Fig. 2, whereby as the said cam or clutch-operating disk is moved to start the machine the brake will be moved out of operation.

To increase or diminish the throw of the hammer, the crank-pin is adjustably mounted in its disk (see Figs. 1l, 4t, and 4b) by means of the set-screw U, which may be turned to move the pin nearer to or farther from the center of the disk.

In operation the reciprocations of the springarms are imparted to the hammer, and if rapid and heavy blows are desired the rapid reciprocation will give blows equal to those delivered by the hammer-head falling at that speed plus the power exerted by the spring-arms in tending to separate as they move along the inclined ways.

The springs, it will be understood, may be given an outward set to increase their power; or heavy springs may be employed. They should, however, be proportioned to the weight of the hammer-head and the character of the work, so as to secure a quick effective blow.

Having thus described my invention, what I claim as new is-A l. In a power hammer, the combination with the reciprocatory hammer head, power shaft and spring arms interposed between the power shaft and hammer head, of the drive pulley j ournaled loosely on the power shaft, the clutch for connecting the pulley and shaft, the clutch shifter for throwing the clutch into engagement, the loose belt for the pulley and the belt tightener moved by the clutch shifter, whereby the clutch may be thrown into engagement and the belt tightened by a continued operation substantially as described.

2. In a power hammer, the combination with the reciprocatory hammer head, power shaft, drive pulley loose on the shaft and a clutch interposed between the pulley and shaft, of a friction brake for arresting the shaft and hammer head, a clutch shifter, a belt tightener for controlling the driving belt for the pulley and a common operating lever for said brake, clutch shifter and belt tightener; substantially as described.

3. In a power hammer, the combination with the reciprocating hammer head having the ways formed in a single piece of metal secured thereon, said ways being inclined for a short distance at the top, then running vertically and then having their lower ends inclined again, as shown, the power shaft, the crank on the power shaft, the pair of spring arms reciprocated by the crank and working in the ways, said arms forming the support for the hammer head; substantially as described.

4. In a power hammer, the combination with the reciprocating hammer head, power shaft and spring arms interposed between the power shaft and hammer head, of the drive pulley journaled loosely on the power shaft, the clutch for connecting the pulley and shaft, the disk having the cam or projection, mounted on the shaft, between the pulley and frame of the machine, whereby when said disk is turned the cam or projection Will force the disk and pulley outward and throw the clutch into engagement, substantially as described.

VILLIAM H. BOTTING. Witnesses:

F. I-I. RIDEOUT, JosEPH L. CLARK.

IOO 

